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Chemistry Past Questions

Study and practice Chemistry past questions with answers and detailed explanations. Then test your knowledge using our interactive CBT practice platform and prepare confidently for your upcoming examinations.

50 questions JAMB 2505 WAEC 1623 NECO 168 CUSTOM 10

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50 questions

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Question 21

waec 2015

The gas given off when ethanol reacts with sodium is

ACarbon(IV)oxide

BHydrogen

CMethane

DOxygen

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Question 22

waec 2015

The following transition metal ions would be coloured in aqueous solution except________?

ACr³⁺

BFe³⁺

CMn³⁺

DSc³⁺

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Question 23

waec 2015

Which of the following pairs of compounds belongs to the same homologous series?

AC₃H₈ and C₃H₆

BC₄H₁₀ and C₅H₁₀

CC₂H₄ and C₄H₁₀

DC₂H₆ and C₄H₁₀

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Question 24

waec 2015

Which of the following pairs of elements forms amphoteric oxides?

ABe and Mg

BNa and K

CB and Al

DSi and Pb

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Question 25

waec 2015

A metallic ion Z\(^{2+}\) with an inert gas structure contains 18 electrons. How many protons are contained in this ion?

A20

B18

C16

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Question 26

waec 2015

The shape of a molecule of water is _______?

ANon-linear

BOctahedral

CPyramidal

DTetrahedral

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Question 27

waec 2015

The compound formed between ₁₄X and ₁₆Y is _______?

AXY

BXY₂

CX₂Y

DX₄Y₆

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Question 28

waec 2015

The Van der waals' forces are dominant intermolecular forces in_______?

AAmmonium chloride

BChlorine

CSodium chloride

DWater

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Question 29

waec 2015

How many orbits are contained in an atom with atomic number 13?

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Question 30

waec 2015

The negatively charged particle in an atom is the

AElectron

BNeutron

CPositron

DProton

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